周五盘中，纳指三倍做多ETF（TQQQ）大跌5.52%，反映出投资者对科技股估值和美联储政策前景的担忧情绪正在加剧。
导致TQQQ大跌的主要原因有以下几点：
1. AI泡沫担忧升温。随着人工智能相关公司股价在过去一年持续上涨，部分投资者开始担心估值过高。多家华尔街机构警告AI板块可能存在泡沫，引发投资者对高估值科技股的谨慎情绪。
2. 美联储降息预期骤降。多位美联储官员近期发表谨慎言论，导致市场对12月降息的预期从一周前的70%骤降至50%左右。利率前景的不确定性对高估值科技股形成压力。
3. 避险情绪升温。在经济数据缺失和政策不确定性增加的背景下，投资者倾向于减持风险资产，转而投向更具防御性的板块。
作为纳斯达克100指数的三倍杠杆ETF，TQQQ对市场波动的反应更为剧烈。投资者需要密切关注即将公布的经济数据和美联储官员讲话，它们可能进一步影响市场对利率前景的预期，从而影响TQQQ等高风险ETF的表现。
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